diff --git a/kern/kern_p1003_1b.c b/kern/kern_p1003_1b.c
--- a/kern/kern_p1003_1b.c
+++ b/kern/kern_p1003_1b.c
@@ -242,7 +242,7 @@
 		p31b_proc_done(targetp);
 	}
 	if (e == 0)
-		copyout(&sched_param, uap->param, sizeof(sched_param));
+		e = copyout(&sched_param, uap->param, sizeof(sched_param));
 	return e;
 }